JPH02158800A - Speaker box of electronic musical instrument - Google Patents

Abstract

PURPOSE:To improve sound quality by combining an upper case and lower case to constitute a housing and hermetically isolating a speaker housing part within the housing by reinforcing ribs of the respective upper and lower cases. CONSTITUTION:The upper case 1 consists of a central body part 2, speaker mounting parts 3 on both sides thereof and a frame 4 which projects forward. The reinforcing ribs 5 are integrally formed to the lower part on the front face of the central body part 2. The lower case 7 consists of the speaker housing part 8 corresponding to the speaker mounting part 3 of the upper case 1, the reinforcing ribs 9 formed integrally to the front thereof an a keyboard housing part 10. The speaker housing part 8 side in the rear of the housing constituted of the upper and lower cases 1, 7 is partitioned from the keyboard housing part 10 side in the front part by the ribs 5, 9 of the upper and lower cases 1, 7 and is thereby hermetically isolated. The sound leakage from the unnecessary part around the speaker is minimized in this way and the sound quality is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an assembly structure of a speaker box for an electronic musical instrument.

[Prior Art] Various electronic musical instruments have been developed that are equipped with a sound source oscillator, an acoustic waveform former, an amplifier, a speaker, and various electronic circuits, and generate electronic sounds by operating various buttons on a keyboard and an operation board. In conventional electronic musical instruments, as described in Taikibaji Publication No. 103382/1982, a keyboard is arranged in the front part of the casing that constitutes the main body of the instrument, and a speaker is attached to the rear part of the casing. ing.

[Problems to be Solved by the Invention] In terms of the structure of conventional electronic musical instrument speaker mounting, the speaker housing section (speaker box) inside the housing is not particularly partitioned and is open to the front keyboard housing section. Ta. As a result, sound from the speakers leaked toward the keyboard, reducing sound quality. In addition, when the housing is constructed by combining an upper case and a lower case, it is necessary to provide sound wave prevention measures along the entire circumference of the joint between the upper case and the lower case in order to prevent sound leakage from the outer periphery of the housing. However, the assembly work is troublesome and increases costs. Also, the sound quality is poor because the speaker box is not tightly sealed, and depending on the housing structure, it may be particularly difficult to generate low temperatures.

The present invention has been made in view of the above-mentioned drawbacks of the prior art, and it is an object of the present invention to provide a speaker box for an electronic musical instrument that has a simple structure, easily seals a speaker accommodating portion, and improves sound quality.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a speaker box for an electronic musical instrument, in which an upper case and a lower case constitute a housing of the electronic musical instrument, and a speaker housing is provided in the housing. In this case, a rib for separating the speaker accommodating portion from each other is integrally provided on at least one of the upper case and the lower case.

[Function] A housing is constructed by combining the upper case and the lower case, and the speaker accommodating portion is hermetically isolated within the housing by ribs that serve to reinforce the upper and lower cases.

[Example 1] FIG. 1 is a perspective view of an upper case and a lower case constituting the main body casing of an electronic musical instrument according to the present invention. Upper case 1
The main body part 2 is a panel surface on which various musical tone control settings are made, speaker mounting parts 3 on both sides of the central main body part 2, and a frame 4 projecting forward. A reinforcing lip 5 is integrally formed on the lower front surface of the central body part 2, and constitutes a part of a partition wall for partitioning the central body part 2 from the front part on which the keyboard is placed. Recesses 21 for passing the speaker bundle wires are provided at two locations along the edge of the rib 5, and a foamed polyethylene member 20 for preventing sound leakage is provided below the recesses along the edge. . A keyboard installation space 6 is formed between the rib 5 and the frame 4. The lower case 7 includes a speaker accommodating part 8 corresponding to the speaker mounting part 3 of the upper case 1, a reinforcing rib 9 integrally formed in front of the speaker accommodating part 8, and a keyboard accommodating part corresponding to the keyboard installation space 6 of the upper case 1. It consists of 10.

FIG. 2 shows a state in which the upper case 1 and the lower case 7 are combined. In the housing constituted by the upper and lower cases, the rear side of the speaker accommodating section is partitioned off from the keyboard accommodating section of the front section by ribs 5.9 of the upper and lower cases and hermetically isolated. At this time, this state in which it is desirable to install a foamed polyethylene member along the edge of the rib 5 to prevent sound leakage as in this embodiment is further illustrated in FIG. As shown in Figure 3(a),
By combining the upper case 1 and the lower case 7, a speaker housing space 20 as shown in FIG. 3(b) is formed inside. The speakers 12 are installed in the speaker accommodating portions 8 on both sides of the speaker accommodating space 20 . The speaker housing space 20 is separated from each other at its center by a partition wall 11 for preventing interference between the two speakers.

4 and 5 are a longitudinal sectional view and a top view, respectively, of an electronic musical instrument according to the present invention. A keyboard 13 is disposed at the front of a housing consisting of an upper case 1 and a lower case 7, and a speaker 12 is mounted at the rear. The upper and lower cases 1.7 have a central boss 14a.

15a and rear bosses 17 and 18, and are screwed and fixed to each other using screws 16. Then, the ribs 5 and 9 separate the speaker accommodating section 8 within the housing from the keyboard accommodating section 10. At this time, the connection between the speaker 12 and the musical sound generator (not shown) is made through the speaker bundle wire hole 21 provided at the lower end of the rib 5.
0 around the speaker box effectively prevents sound leakage. Partition wall 1 provided on the inner surface of upper case 1
1, as shown in FIG. 5, has a two-plate structure to reliably prevent mutual acoustic interference between the left and right speakers 12. The number of partition plates may be three or more. Furthermore, by adjusting the mounting position of the partition plate 11, the volumes of the left and right speaker boxes can be changed, and the acoustic characteristics of the speakers can be changed.

[Effects of the Invention] As explained above, in the speaker box for an electronic musical instrument according to the present invention, the speaker housing portion can be formed in a sealed manner by simply combining the upper case and the lower case, and the speaker box surrounding the speaker can be sealed. Sound leakage from unnecessary parts of the system is minimized, the acoustic effect is enhanced, and the sound quality is improved. Furthermore, since there is no need to take measures to prevent sound leakage around the entire circumference of the casing, manufacturing work becomes easier and costs are reduced. In addition, the sealed structure improves sound quality, and
By considering other housing structures, it is also possible to make it easier to produce bass sounds than before.

[Brief explanation of the drawing]

1 is a perspective view of an upper case and a lower case constituting a speaker box of an electronic musical instrument according to the present invention; FIG. 2 is a perspective view of the upper case and lower case of FIG. 1 in an assembled state;
FIG. 3 is an explanatory diagram of the speaker housing space of the present invention, FIG. 4 is a sectional view of an electronic musical instrument equipped with the speaker box structure of the present invention, and FIG. 5 is a top view of the electronic musical instrument of FIG. 4. 1: Upper case, 5.9: Rib, 7: Lower case, 8: Speaker housing, 10: Keyboard housing, 11: Partition plate, 12 Varnish and one piece, 13: Keyboard. Figure Figure

Claims (1)

[Claims] In a speaker box for an electronic musical instrument in which an upper case and a lower case constitute a housing of the electronic musical instrument and a speaker housing is provided within the housing, a rib for isolating and forming the speaker housing within the housing is provided in the upper case. A speaker box for an electronic musical instrument, characterized in that the speaker box is integrally provided in at least one of a case and a lower case.